The expected average rate of return for a proposed investment of $699,000 in a fixed asset, with a useful life of 4 years, straight-line depreciation, no residual value, and an expected total net income of $216,000 for the 4 years, is (round to two decimal points).

a.7.73%

b.30.90%

c.15.45%

d.13.90%

please explain